Charles Sanders Peirce quote: “There never was a sounder logical maxim of scientific procedure than Ockham's razor: Entia non sunt multiplicanda praet…”

“But you will mark the limitation of my approval of Ockham's razor. It is a sound maxim of scientific procedure. If the question be what one ought to believe, the logic of the situation must take other factors into account.”

Charles Sanders Peirce (1839–1914) American philosopher, logician, mathematician, and scientist

Lecture II : The Universal Categories, §3. Laws: Nominalism, CP 5.60
Pragmatism and Pragmaticism (1903)
Context: There never was a sounder logical maxim of scientific procedure than Ockham's razor: Entia non sunt multiplicanda praeter necessitatem. That is to say; before you try a complicated hypothesis, you should make quite sure that no simplification of it will explain the facts equally well. No matter if it takes fifty generations of arduous experimentation to explode the simpler hypothesis, and no matter how incredible it may seem that that simpler hypothesis should suffice, still fifty generations are nothing in the life of science, which has all time before it; and in the long run, say in some thousands of generations, time will be economized by proceeding in an orderly manner, and by making it an invariable rule to try the simpler hypothesis first. Indeed, one can never be sure that the simpler hypothesis is not the true one, after all, until its cause has been fought out to the bitter end. But you will mark the limitation of my approval of Ockham's razor. It is a sound maxim of scientific procedure. If the question be what one ought to believe, the logic of the situation must take other factors into account. Speaking strictly, belief is out of place in pure theoretical science, which has nothing nearer to it than the establishment of doctrines, and only the provisional establishment of them, at that. Compared with living belief it is nothing but a ghost. If the captain of a vessel on a lee shore in a terrific storm finds himself in a critical position in which he must instantly either put his wheel to port acting on one hypothesis, or put his wheel to starboard acting on the contrary hypothesis, and his vessel will infallibly be dashed to pieces if he decides the question wrongly, Ockham's razor is not worth the stout belief of any common seaman. For stout belief may happen to save the ship, while Entia non sunt multiplicanda praeter necessitatem would be only a stupid way of spelling Shipwreck. Now in matters of real practical concern we are all in something like the situation of that sea-captain.

“When two hypotheses are possible, we provisionally choose that which our minds adjudge to be simpler, on the supposition that this is the more likely to lead in the direction of truth. It includes as a special case the principle of Occam's razor-entia non multiplicana praeter necessitatem.”

James Jeans (1877–1946) British mathematician and astronomer

Physics and Philosophy (1942)

“For policy, the central fact is that Keynesian policy recommendations have no sounder basis, in a scientific sense, than recommendations of non-Keynesian economists or, for that matter, non-economists.”

Thomas J. Sargent (1943) American economist

Robert Lucas, Jr. and Thomas J. Sargent, "After Keynesian macroeconomics", After the Phillips Curve: Persistence of High Inflation and High Unemployment (1978).

“For policy, the central fact is that Keynesian policy recommendations have no sounder basis, in a scientific sense, than recommendations of non-Keynesian economists or, for that matter, non-economists.”

Robert Lucas Jr. (1937) American economist

"After Keynesian macroeconomics" 1978

“The hypothesis you refer to as God, though not disprovable by logic alone, is unnecessary for the following reason.
If you assume that the universe can be quote explained unquote as the creation of an entity known as God, he must obviously be of a higher degree of organization than his product. Thus you have more than doubled the size of the original problem, and have taken the first step on a diverging infinite regress. William of Ockham pointed out as recently as your fourteenth century that entities should not be multiplied unnecessarily. I cannot therefore understand why this debate continues.”

Arthur C. Clarke book The Fountains of Paradise

Source: The Fountains of Paradise (1979), Chapter 16 “Conversations with Starglider” (p. 95)

“There is an art to knowing where things should be checked and making sure that the program fails fast if you make a mistake. That kind of choosing is part of the art of simplification.”

Ward Cunningham (1949) American computer programmer who developed the first wiki

A Conversation with Ward Cunningham (2003), The Simplest Thing that Could Possibly Work

“It was easier to know it than to explain why I know it. If you were asked to prove that two and two made four, you might find some difficulty, and yet you are quite sure of the fact.

~ Sherlock Holmes”

Arthur Conan Doyle book A Study in Scarlet

Source: A Study in Scarlet

“We never had a sounder intelligence in this Republic. He was the equal of Washington in making American liberty possible.”

Thomas Edison (1847–1931) American inventor and businessman

The Philosophy of Paine (1925)
Context: Tom Paine has almost no influence on present-day thinking in the United States because he is unknown to the average citizen. Perhaps I might say right here that this is a national loss and a deplorable lack of understanding concerning the man who first proposed and first wrote those impressive words, 'the United States of America.' But it is hardly strange. Paine's teachings have been debarred from schools everywhere and his views of life misrepresented until his memory is hidden in shadows, or he is looked upon as of unsound mind.
We never had a sounder intelligence in this Republic. He was the equal of Washington in making American liberty possible. Where Washington performed Paine devised and wrote. The deeds of one in the Weld were matched by the deeds of the other with his pen.

“The prevailing economic theory of business enterprise and behavior, the maximization of profit—which is simply a complicated way of phrasing the old saw of buying cheap and selling dear—may adequately explain how Richard Sears operated. But it cannot explain how Sears, Roebuck or any other business enterprise operates, nor how it should operate. The concept of profit maximization is, in fact, meaningless.”

Peter F. Drucker (1909–2005) American business consultant

Source: 1960s - 1980s, MANAGEMENT: Tasks, Responsibilities, Practices (1973), Part 1, p. 59 (1986 ; 45)

“For me, as I later came to say, cybernetics is the art of creating equilibrium in a world of possibilities and constraints. This is not just a romantic description, it portrays the new way of thinking quite accurately. Cybernetics differs from the traditional scientific procedure, because it does not try to explain phenomena by searching for their causes, but rather by specifying the constraints that determine the direction of their development.”

Ernst von Glasersfeld (1917–2010) German philosopher

Source: Partial Memories: Sketches from an Improbable Life, 2010, p. 136

“There never was a sounder logical maxim of scientific procedure than Ockham's razor: Entia non sunt multiplicanda praeter necessitatem. That is to say; before you try a complicated hypothesis, you should make quite sure that no simplification of it will explain the facts equally well.”

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